<?php
header("content-type:text/html;charset=utf-8");

class Car{
	//属性
	public $carMode;//存放车的型号
	public $carBand;//存放车的品牌
	public $weight;//车的重量
	public $speed;//车的速度
	//方法

	//与类名相同，构造函数，
	//用于对象创建时给属性一次性就值
	function Car($m,$b,$w,$s){
		$this->carMode = $m;
		$this->carBand = $b;
		$this->weight = $w;
		$this->speed = $s;
	}

	function getWeight(){
		return $this->weight;
	}
	function getSpeed(){
		return $this->speed;
	}
}

// 使用类来创建新的对象，实例化
$car1 = new Car("捷达","大众",1.5,160);
echo "<pre>";
print_r($car1);
echo $car1->getSpeed();
echo $car1->getWeight();

class BMWCar extends Car{}

$bmw1 = new BMWCar("宝马","大众",2,200);
echo "<pre>";
print_r($bmw1);
echo $bmw1->getSpeed();